As summarized in Table REF , we provide an ablation study to justify the use of our pyramidal transformers for cost aggregation. To this end, it is perhaps necessary to compare with other methods including 4D convolutions [1]}, [2]} and efficient transformers [3]}, [4]}. As 4D convolution as in [2]} also aggregates the matching scores in a local manner similar to swin transformer [6]}, we conjecture that it should perform similarly or even better. We investigate this and report the results to confirm that VTM exceeds other aggregators.
